Kounotori 8

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Kounotori 8
HTV 8 release.jpg
H-II Transfer Vehicle (HTV-8) being grappled by the Canadarm2 on 1 November 2019.
Mission type ISS resupply
Operator JAXA
COSPAR ID 2019-062A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 44546
Mission duration40 days
Spacecraft properties
SpacecraftKounotori 8
Spacecraft type HTV
Manufacturer Mitsubishi Heavy Industries
Launch mass15800 kg [1]
Dry mass10500 kg
Payload mass5300 kg
Dimensions9.8 metre of long,
4.4 metre of diameter
Start of mission
Launch date24 September 2019,
16:05:05 UTC [2]
Rocket H-IIB No. 8
Launch site Tanegashima, Yoshinobu-2
Contractor Mitsubishi Heavy Industries
End of mission
DisposalDeorbited
Decay date3 November 2019
Orbital parameters
Reference system Geocentric orbit
Regime Low Earth orbit
Inclination 51.66°
Berthing at ISS
Berthing port Harmony nadir
RMS capture28 September 2019,
11:12 UTC [3]
Berthing date28 September 2019,
14:09 UTC [4]
Unberthing date1 November 2019, 13:45 UTC [5]
RMS release1 November 2019, 17:21 UTC [6] [7]
Time berthed34 days
Cargo
Mass5300 kg
Pressurised3400 kg
Unpressurised1900 kg
 

Kounotori 8 (こうのとり8号機), also known as HTV-8 was the 8th flight of the H-II Transfer Vehicle, a robotic cargo spacecraft to resupply the International Space Station. It was launched on 24 September 2019, 16:05:05 UTC. [8]

Contents

Spacecraft

Major changes from previous Kounotori are: [9]

Cargo

Kounotori 8 carries about 5300 kg of cargo, consisting of 3400 kg in the pressurized compartment and 1900 kg in the unpressurized compartment. [9]

Cargo in the Pressurized Logistics Carrier (PLC) include: [9]

In the Unpressurized Logistics Carrier (ULC), Kounotori 8 carries six lithium-ion batteries Orbital Replacement Units (ORUs) for replacing the ISS's existing nickel-hydrogen batteries. The transportation of replacement batteries is a continuation from the previous Kounotori 6 and 7, and will continue through to Kounotori 9. [9]

Operation

Launch

The H-IIB launch vehicle carrying Kounotori 8 was initially scheduled to be launched at 21:33:29 UTC, 10 September 2019. [11] [12] During launch preparation, a fire broke out at the launch pad at around 18:05 UTC (T minus 3.5 hours), and the launch was called off. [13] The cause of fire was attributed to the static electricity on the heat resistant material under the mixture of liquid oxygen and gas oxygen for the engine pre-cooling. [14]

After the modification to the mobile launch platform to suppress static electricity, a new launch was scheduled at 23 September 2019, 16:30 UTC, [14] but the collision avoidance check revealed that the 2nd stage of the launch vehicle might approach near the Soyuz MS-15 which was scheduled to be launched on 25 September 2019. A revised launch schedule was set for 16:05 UTC, 24 September 2019. [15] On 24 September 2019, 16:05:05 UTC, the Kounotori 8 aboard H-IIB was launched successfully. [8]

Operation while berthed to the ISS

Kounotori 8 was captured by the Space Station Remote Manipulator System (SSRMS) at 23:13 UTC, on 27 September 2019, [16] and berthed at Harmony's nadir Common Berthing Mechanism (CBM) by 17:55 UTC, on 28 September 2019. [17]

The External Palette (EP8), which carries the lithium-ion battery Orbital Replacement Units (ORU), was extracted from the Kounotori 8's Unpressurized Logistics Carrier (ULC) by the SSRMS (Canadarm2) on 29 September 2019. [18]

The External Palette of Kounotori 7 (EP7) was placed in the Kounotori 8's ULC. [19] EP7 was left on the ISS after the departure of Kounotori 7 due to the schedule change of extravehicular activity after the launch failure of Soyuz MS-10.

Departure and reentry to the Earth atmosphere

On 1 November 2019, Kounotori 8 was detached from Harmony's CBM by the SSRMS (Canadarm2), and it was released into orbit at 17:20 UTC. [20]

It was disposed by the destructive reentry to the Earth atmosphere at around 02:09 UTC, on 3 November 2019. [21]

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References

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